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M. S. GABELL 82; W. W. ABNEY.

FLUID PRESSURE REGULATOR. No. 322,519. Patented July 21, 1.885.

mneimes I I [pueniard/ a? 0% mgzgm 1 I E @427 W By N. PETERS.Phnla-Lilhagraphu. Washington. D. c.

' UNITED STATES PATENT OFFICE.

MILTON S. OABELL AND WILLIAM NV. ABNEY, OF QUINCY, ILL, ASSIGNORS OFONE-THIRD TO ROBERT W. HANNA, OF SAME PLACE.

FLUID=PRESSURE REGULATOR.

SPECIFICATIQN forming part of Letters Patent No. 322,519, dated July 21,1885.

Application filed May 2, 1885. (No model.)

To all whom it may concern:

Be it known that we, MILTON S. CABELL and WILLIAM W. ABNEY, citizens ofthe United States, residing at Quincy,- in the county of Adams and Stateof Illinois, have invented certain new and useful Improve ments inFluid-Pressure Regulators; and we do hereby declare the following to bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertaius to make and usethe same.

Our invention relates to means for regulating the pressure of elasticfluids generated by heat; and the object of our invention is to provideautomatic means for maintaining the desired pressure by regulating theheat of the furnace, the same being controlled by variations in thedraft of the furnace.

To this end our invention consists in connecting with the boiler orgenerator a valve which may be weighted like and operated in the natureof a safety-valve, and in conducting the fluid which passes throughsuchvalve to a cylinder for operating a piston,which in turn operatesthrough suitable connections a register or damper for varying the draftthrough the furnace.

Our invention also consists in certain de tails and specialcombinations, which will be hereinafter particularly described,andpointed out in the claim.

The drawing is a side view of a steamboiler with my invention attached,partly in section and partly in elevation.

A represents the boiler; B, the smoke-stack or breeching; and D, avalve, constructed and operating like a safety valve, arranged so thatescaping steam will pass through a pipe,

(1, into the lower end of a cylinder, E. The valve-stem is provided witha movable head, f, which is forced upward against its seat by a spring,9, to prevent steam escaping around the stem. Cylinder E is providedwith a piston, E, suitably packed. The piston-rod E passes through aguidebox in the upper end of the cylinder and is connected with a cord,chain, or wire, F, which passes over guide-pulleys to a register, G, towhich it is fastened. The register is weighted on one side, as shown, oris provided with a spring, 5

which acts to keep it open and pulls at all times in a directionopposite to the cord.

Piston D is weighted sufficiently to overcome the spring or the weighton the register and to keep the register normally closed. A suit- 5 ablepet-cock, e, is connected wit-h the steampassage to draw off the waterof condensation. I also provide a spring, .9, to cushion the pistonagainst the head of the cylinder.

Normally the register is closed and the pis- 6 ton E is down, but whenthe fiuidin the generator reaches a pressurc'sufficieut to open thevalve the fluid passes through it and the' pipe (1 into the cylinder E.The piston is then raised, the cord loosened, and the mg 6 isteropenedby the weight or spring, when the air rushes into the flue and lessensthe draft through the fire. When the pressure of the steam is lowered,the valve closes and the piston falls and closes the register. j

We are aware that a draftregulator has been proposed to be operated bysteam escaping through the safety-valve, the cylinder in such case beingprovided with blow-off or exhaust-passages. This,however,fails to keepthe draft closed for any effective length of time. Such we do not claim;but

\Vhat we do claim is- A fluid-pressure regulator consisting of thecombination of the boiler or generator, a valve adjustable to open at apredetermined pressure and acted upon directly by the steam in thegenerator, a closed cylinder,a weighted piston, a weighted register ordamper, and means for connecting the damper and piston, whereby thepiston is operated and the valve or damper is open and held untilpressure is reduced in the boiler by reason of change of temperature inthe furnace, as described.

In testimony whereof we affix our signatures in presence of twowitnesses.

MILTON S. CABELL. W'ILLIAM W'. ABNEY. Tit-messes:

WILLIAM WHYUs, GEORGE A. RUPP.

